It really depends on what you are doing. If you keep them super clean and aren't sweating a lot, you could do that 4–5 day span. (5 is actually a real stretch). If you are very active in your jeans, I think it's more likely to be 3 days.
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There is no issue with that as long as the pants are not dirty and still in good condition. I seriously doubt that most people would consistently change jeans every single day and there isn't a need to. Wearing the same pair of jeans more often allows you to break it in more, give it that vintage look from ...